Thermodynamic Systems.docx - System what is being observed or studied substances involved in the process we are studying make up the system Surroundings

Thermodynamic Systems.docx - System what is being observed...

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System: what is being observed or studied; substances involved in the process we are studying make up the system Surroundings: the system’s environment Thermodynamic state of the system: a set of conditions that completely specifies all the properties of the system: (state functions: T,P,and V,) composition, state of matter Enthalpy, H Calorimetry: heat gained = heat lost; amount of heat released by vxn = amount of heat absorbed by calorimeter + amount of heat absorbed by the solution Isolated- off, nothing can be exchanged Open- energy and matter can be exchanged DH f 0 - standard molar heat (enthalpy) of formation C 2 H 5 OH + 3O 2 -> 2CO 2 + 3H 2 O + 1367 kJ thermochemical equation DH = -1367kJ CH 3 OCH 3 - dimethyl ether 2.61g burned and produces 82.5 kJ of heat, DH? CH 3 OCH 3 + 3O 2 => 2CO 2 + 3H 2 O Kj/mol rxn = 82.5gkJ/2.61g x 46gCH 3 OCH 3 / mCH 3 OCH 3 x 1m CH 3 OCH 3 / mol rxn = 1450kJ -1450kJ = DH Isomers: same compound but different structures 2Al 2 O 3 3352 kj/mol x 1mol/46g Hess’ Law: DH for a reaction is the same whether it is in one step or is multi-step
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